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研究生： 陳佩纖
Chen, Pei-Hsien
論文名稱： 以紅外線測溫與質點影像測速技術探討具百葉窗擾流器管道脈動紊流與熱傳增益
IRT and PIV Study on Pulsatile Turbulent Channel Flow and Heat Transfer Enhancement with Louvered Turbulators
指導教授： 劉通敏
Liou, Tong-Miin
張始偉
Chang, Shyy-Woei
口試委員: 吳興茂
Wu, Sing-Maw
張錦裕
Jang, Jiin-Yuh
學位類別： 碩士
Master
系所名稱： 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年： 2019
畢業學年度： 108
語文別： 中文
論文頁數： 156
中文關鍵詞： 三維百葉窗擾流器 、質點影像測速儀 、紅外線熱像儀 、脈動流 、熱傳增益
外文關鍵詞： Louvered-type turbulators, Particle Image Velocimetry, Infrared Thermography, Pulsating flow, Heat Transfer Enhancement
相關次數： 點閱：3  下載：0 
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    • 由於能源枯竭，因此為了提高能源轉換的效率，高效率熱交換器已成為工業界及學術界共同努力的目標。在熱交換器內加裝擾流器，如肋條（Rib）、折流板（Baffle）等是提升其熱傳效率的最佳方式之一。而本研究根據前人所設計之三維百葉窗型擾流器百葉窗（Louver），並透過紅外線測溫儀（Infrared Thermography，IRT）、質點影像測速儀（Particle Image Velocity，PIV）與壓力傳感器量測於正方形雙通道內的穩態及脈動兩種入口條件下之紊性熱流場。在穩態下百葉窗擾流器之扇葉攻角固定為30度，截距比(Pi⁄DH )與雷諾數(Re)變化參數分別為1、1.25、1.5及5,000至20,000。由實驗結果發現在Pi⁄DH =1.25之下，相較於前人之百葉窗擺放方式，於定泵功率條件，其TPF可以提升6.9-12.1%。而為了進一步提升熱傳效果，將原先穩態改為脈動入口邊界條件，並在最佳截距比條件下變化脈動頻率，史卓赫數(St)介於0.2至0.7，探討其熱傳增益及壓損變化。實驗結果指出，熱傳增益及壓損會隨著脈動頻率單調提升，在史卓赫數0.7時擁有最佳熱傳增益，相較於穩態條件下提升26.8%；並由實驗數據提出一個可應用於三維百葉窗型擾流器與平滑管道在穩態及脈動下之經驗公式來預測紐賽數

    Due to the exhaustion of energy, high-efficiency heat exchangers have become the goal of industry and academia in order to improve the efficiency of transform. To install turbulators, such as Ribs, Baffle, etc. is one of the best ways to improve the heat transfer efficiency. This study is base on a 3-D louver-type turbulator which is designed by the previous study, and the turbulent heat flow field under steady-state and pulsating inlet conditions in a square two-pass channel is measured by Infrared Thermography(IRT), Particle Image Velocimetry(PIV) and Pressure transfer. At steady state, the slat attack angle at louver-type turbulator is fixed at 30∘, pitch ratio and Reynolds number are in the range of 1, 1.25, 1.5, and 5,000 to 20,000. It is found from the experimental results that when the pitch ratio is 1.25, the thermal performance factors(TPF) in the present case are 6.9-12.1% higher than the previous study. In order to further improve the heat transfer effect, the origin steady state is changed to pulsation inlet boundary condition, the pitch ratio is fixed at 1.25 and Strouhal number is in the range of 0.2 to 0.7. Consequently, the heat transfer enhancement and pressure drop simultaneously elevate when the pulsating frequency increase and the pulsating frequency St=0.7 has the best heat transfer enhancement, and which is 26.8% higher than the steady state. Based on the experimental results, an empirical correlation can be proposed to apply to a 3-D louvered-type and smooth channel under steady and pulsation flow to predict the Nusselt number.

    摘要 I Abstract II 致謝 III 目錄 IV 表目錄 VII 圖目錄 VIII 符號說明 XIV 第1章 緒論 1 1-1 前言 1 1-2 文獻回顧 3 1-2-1 低阻擋比擾流器 3 1-2-2 高阻擋比擾流器 10 1-2-3 脈動流 13 1-3 研究目的 15 1-3-1 穩態流 16 1-3-2 脈動流 17 第2章 實驗系統與方法 36 2-1 實驗模型及構造 36 2-1-1 流力實驗模型 36 2-1-2 熱傳實驗模型及壓力量測方式 37 2-1-3 脈動閥模型 37 2-1-4 三維百葉窗擾流器幾何結構 38 2-2 實驗系統 38 2-2-1 內流道冷卻系統 38 2-2-2 光學量測系統 39 2-2-3 全域熱傳量測系統 42 2-2-4 壓力量測系統 43 2-3 實驗條件及校正 43 2-3-1 實驗條件 43 2-3-2 紅外線熱像儀校正 44 2-3-3 熱損失實驗 45 第3章 實驗數據處理及誤差分析 62 3-1 實驗數據處理 62 3-1-1 熱傳實驗數據處理 62 3-1-2 壓力量測數據處理 63 3-2 實驗誤差估算及分析 64 第4章 於雙通道中加裝百葉窗型擾流器之穩態實驗結果與討論 67 4-1 穩態實驗技術驗證 67 4-1-1 全展下方管主流速度驗證 67 4-1-2 熱傳實驗技術驗證 67 4-1-3 壓損實驗技術驗證 68 4-2 截距比與交錯擺放之效應 68 4-2-1 紐塞數分佈 68 4-2-2 整體平均熱傳及壓損 73 4-2-3 當前實驗結果與先前文獻比較 75 4-3 流場結構 78 4-3-1 第一通道流場結構 78 4-3-2 轉彎區流場結構 80 4-3-3 第二通道流場結構 82 4-4 熱傳與流場相關性 84 第5章 於雙通道中加裝百葉窗型擾流器之脈動實驗結果與討論 104 5-1 脈動實驗條件 104 5-2 脈動實驗邊界條件 104 5-3 脈動實驗技術驗證 104 5-3-1 全展下方管主流速度驗證 105 5-3-2 熱傳實驗技術驗證 105 5-4 脈動頻率效應 106 5-4-1 紐塞數分佈 106 5-4-2 整體平均熱傳及壓損 107 5-4-3 當前實驗結果與先前文獻比較 109 5-5 流場結構 110 5-5-1 第一通道流場結構 110 5-5-2 轉彎區流場結構 113 5-5-3 第二通道流場結構 116 5-6 熱傳及流場相關性 118 5-7 熱傳關係式 119 第6章 結論 141 6-1 結論 141 6-1-1 穩態流 141 6-1-2 脈動流 141 6-2 未來建議 142 附錄A論文口試之補充答辯 144 參考文獻 149

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